Bison



(No Model.)

@www

WITN ESSE. S.

J.v 0. HARRISON. Y SLOT DRILLING MACHINE.

Patnted Oct. 27, v1896.

mvENTR. Qg, ,Na/mw (No Model.) '1 sham-,sheen 2i J. C. HARRISON. f SLOT DRILLING MACHINE.

No. 570,091. Patented oct. 27,1896;

lNVENTOR YH: Nonms PETERS co.. Pnomuuov. wAsmwsToN. n. c4

(No ModeL) 'I Sheets-Sheet 4.

J. C. HARRISON.

. .SLOT DRILLING MACHINE.

No. 570,091. Patented Oct. 27, 1896.

nNvaNToR. QGHWWO aff No Model.) 7 Sheets-Sheet; 5.

J. "C, HARRISON. sLoT DRILLING MAGHINB.

No. 570,091. Patented-Oct. 27, 1896'.

F'IG.6.

IN-VENTOR.

(No Model.)

J. G. HARRISON.

SLOT DRILLING MACHINE.

No. 570,091. Patentedoot. 27.1896.

7 Sheets--Sheet 6'.

(No Model.) '1 sheets-sheet 7.

J.'G'. HARRISON. SLOTv DRILLING MACHINE.

No. 570,091. Patented oct. 27, 1896.

v di

| Nv ENToR www ` izda www WITNESSES.

UNITED STATES Parnivr OFFICE.

JOHN O. HARRISON ,OF BOVNESS, ENGLAND.

SLOT-DRILLING MACHINE.

SPECIFICATION forming partof Letters Patent No. 570,091, dated October 27, 1896.

Application filed February 4, 1896. Serial No. 578,036. (No model.)

To all whom t may concern:

Beit known that I, JOHN CoLLINsoN HAR-l RISON, a subj ect of the Queen of Great Britain, residing at Bowness-on-Windermere, in the county of Westmoreland, England, have invented certain new and'useful Improvements in Slot-Drilling Machines, of which thefollowing is a specification.

This invention relates to that class of machines in which key-seats, feather-ways, cotter-holes, cutter-holes, and similar slots in shafts are cutby rotating drills traveling to and fro from end to end of the slot, and is designed to provide a machine in which the work is held centrally and can be done more expeditiously, and by which the holes or slots can be cut at any desired angle.

Y It consists, essentially, in constructing the machine with a drilling-head mounted upon a traversing saddle provided with two rotating spindles placed opposite to each other, so that they may operate at different sides of the work, and 4pivoted upon a trunnion at one end of the saddle, upon which it is oscillated by a crank to give the desired inclination to the slot, the saddle and drilling-head being moved to and fro to traverse the work by crank or crank-pin with an adjustable stroke working in a cross-head connected thereto by a screw or otherwise, and the work being held stationary by centers carried in head-stocks or brackets affixed to the bed.

The invention will be fully described with reference to the accompanying drawings.

Figure l is a plan; Fig. 2, sectional plan; Fig. 3, longitudinal sectional elevation; Fig. 4, end elevation, (enlarged scale;) Fig. 5, transverse section through tool-holder and saddle, (enlarged scaleg) Fig. (i, transverse section through Athe cross-head on line y y, Fig. 3; Fig. 7, sectional elevation through tool-holder and saddle on line o: so,` Fig. 5; Fig. 8, end elevation of tool-holder and saddle from the back.

The drilling-head A and sliding or movable saddle B are carried by or inountedon a bed C, upon which they are traversed backward and forward by a crank N and screw P, with adjustable stroke, the bed C being supported by suitable framework. (Not shown in the drawings.) l

- The sliding saddle B, which rests-upon and lating to one side or the other. The drillinghead is provided with two drills E and F, placed in the same plane at opposite sides of the center, so that a cotter or cutter hole may be drilled with two drills simultaneously from opposite sides. The drill-spindles E and F are mounted in journals and are driven by suitable miter and spur gear c and f from the belt-driven shaft G, which runs along one side of the bed C, the traverse of vthe saddle being accommodated by a sliding key g. in the wheel g and slot g" in the shaft. The drill E is a right-hand drilland the drill F a left-hand one, and they are preferably set with their respective cutting edges at right angles to each other, so that they Amay overlap each other without fouling when joining the hole. XV hen not requiring to drill a hole right through or a keyway on either side of the shaft, either drill may be removed from its spindle and the other used without it.

The radial oscillation or movement of the drilling-head A is transmitted to it by the crank H, thepin h of which is adjustable to vary the throw of the crank and the consequent movement of drill-head. The crankblock 7L works between the two planed faces of the slot H. The crank is driven by the worm J on the shaft J engaging with the worm-wheel j 011 the end of the crank-spindle. The worm-wheel is secured to the spindle by a tapered pin j' passing through it, which can be removed when it i s not desired to rotate the crank and passed through a hole in the casting into the crank-spindle. This is done when it is required to work the drillin g-head without oscillation for'ordinary keyways, the oscillating movement being required to cut tapered holes or slots. The amount of oscillation or movement given to the drill-head is regulated according to the amount of taper required in the slot or hole.

Vhen the apparatus is working, the drills F. and F are each fed forward automatically by a ratchet-wheel K, which is rotated about a screw 7s, connected to the end of the drillspindle. Motion is transmitted from a projection or cam L on the face of the worm- IOO tending into it for `some distance.

wheel by means of an upright pin or rod l, which is moved up and down in a hole in the saddle-casting', and the upper end of which engages with a lever or tappet Z' on a tappetshaft M. The tappet-shaft M passes right through the lower side of the drill-head A, projecting at either-end. On the-ends of the tappet-shaft M are placed the levers m,which, through the connecting-rods m', actuate the pawls 7i", pivoted to the oscillating levers m. rlhe reciprocating traverse movement is imparted to the drill-head A and saddle B by the adjustable crank il at one end of the bed. The crank-pin 1t is adj ustably attached to the disk which carries it by a screw vr, so that the throw of the crank can be readily either lengthened or `shortened to correspond with the length of slot to be cut. The crank-block o works in a slot in the cross-head O.

The crank is actuated by the worm R on the sha-ft J' gearing with the worin-wheel r, the crank being connected to the worm-wheel by the pin i", which can be removed when it is desired to throw the crank out of gear. The worm R `and the worm J being on the same shaft, the movements of the two cranks ll and N are made to correspond, so that the oscillation of the drill-head in one direction or the other corresponds with the traverse of the saddle. The shaft J' is driven by a strap or cord on a stepped pulley J, placed on the end, from a corresponding stepped pulley placed on any adjacent driving-shaft.

The cross-head'O is connected to the saddle B by a screw P passing through a nut or screwed braeketb' on the under side of the saddle. The end of the screw I is connected to the cross-head O, so as to allow it to rotate independently of the reciprocating movement of the cross-head. At the other end of the screw l) it is connectcdto a strap-driven shaft p, which projects up into the interior of the screw to allow of the traverse of the screw by the crank N, the end of the screw being provided with a parallel hole and keyway ex- VVhen it is desired to make a slot longer than the movement of the crank, it is thrown `out of gear by removing the pin r', and the saddle l5 and drill-head A can be traversed nearly the full lengt-h of the bed C by the screw l. The shaft p is fitted with three strap-pulleys and suitable gearing to give a reversing and stopping motion. A handle is provided to turn the screw to bring the drillhead and saddle into any desired position along the length 0f the bed.

U pon the bed C of the machine are placed two movable head-stocks orbrackets SS', provided with centers s `s', between which the work lV is held. The head-stocks or brackets may be clamped to the bed C in any desired position. i

That I claim as my invention, and desire to protect by Letters Patent, is-

l. In a slot-drilling machine the combination with a horizontal bed of a sliding saddle B resting thereon an oscillating drill-head pivoted to the sliding saddle, two drill-spindles E and F carried in journals in the drillhead and two drills E and F set opposite each other and operating on different sides of the work, substantially-as described.

L". A drill-head for a slot-drilling machine comprising a sliding saddle B capable of moving to and fro on a horizontal bed and an oscillating head A carrying two drill-spindles placed opposite to each other and operating` upon dierent sides of the work substantially as described.

3. In a slot-drilling machine the oscillating drilling-head A pivoted upon a sliding saddle and provided with two drill-spindles E and F the sliding saddle B upon which the drilling-head is pivoted and capable of sliding to and fro lon a horizontal bed in combination with the longitudinal driving-shaftG and gear-wheelsg e, and f by whichthe drills v are operated and the longitudinal shaftJ worm J worm-wheel j crank-shaftand crank ll by which the oscillating motion is imparted to the drilling-head A substantially as described.'

Lat. In a slot-drilling machine the combination with the drilling-head A and the sliding saddle B of the connecting-screw P by which they are `moved to and fro on the bed C the cross-head O attached to the end of the screw the rotatin disk N and the crank-pin n which traverses a slot in the cross-head and gives a reciprocating movement thereto substantially as described.

5. In a slot-drilling machine the combination with the drilling-head A the two drillspindles E and F' rotating therein provided with drills E and F oi the cam L on the crankshaft Il the vertical reciprocating rod Z moving up and down in a hole in the casting thc tappet Z on the tappet-shaft Mwith which the upper end of the rod Z en gages the tappetshaft lll projecting through both ends of the drill-head the levers m on the ends ofthe tap pet-shaft `the connecting-rods m levers m and pawls 71;' which actuate the ratchet-wheels K on the ends of the screws 7i: and the right and left hand screws 7c' connected to the drillspindles E and F substantially as described.

G. In a slot-drilling machine the combination with the drilling-head A sliding saddle B and connecting-screw P of the cross-head O attached to one end of the screw the crankdisk N an adjustable crank-pin u traversing a slot in the `cross-head the shaft J the worm R thereon the worm-wheel o connected to the crank and the removable pin r passing through the disk of the crank and the wormwheel fr substantially as described.

7. In a slot-drilling Vmachine `the combination with'the drilling-head Aithe reciproeatin g saddle B and the connecting-screw P of the strap-driven `shaft p `projecting into the interior of the screw strap-pulleys thereon and ICO IIO

bevel-gearing by which the screw may be roro shaft p over the end of which the screwr slides whereby a short or long traverse may be given to the drill-head substantially as described.

In testimony whereof I have signed my name to this speciication in the presence of tWo subscribing` Witnesses.

J. C. HARRISON.

Witnesses:

JAMES W. PRESTON, R. W. HIGGINsoN. 

